Installing Shower Base

I am choosing a pro plumber to install a Jacuzzi shower base in a 2nd floor remodel.

Should I ask him to add a bag of mortar underneath the pan for extra stability?

The spec's say if your floor is level, no mortar is necessary, but a couple of plumbers suggested that they throw a bag under the pan for extra support.

I am choosing between two plumbers today. One didn't mention the mortar and says my job is simple and straightforward and is significantly less expensive.

One is more expensive and talked it up like my job has "details." My tile guy thinks the job is straightforward.

Job consists of : Roughing in the shower valve (raising the shower head a few inches), changing the hardware and corresponding valve on a jacuzzi tub, and installing the shower base. This is all existing plumbing remaining in the same layout.

Any thoughts and advice welcome!!! I didn't realize I would have to become so informed to hire the job out! thx, jgv

Most shower pans will last longer if you bed them in mortar. A few are stiff enough where it isn't a problem. It never hurts and shouldn't cost much extra - you'll usually be happier; the floor will feel solid and if there are minor imperfections in either the pan or the floor, the mortar bed will solve them - 100% support is ideal. My unprofessional opinion.